BLOGS

Introduction: A new chapter for England's green belt

Labour's planning reforms represent the most significant shake-up of green belt policy since its establishment in the 1950s. The introduction of the 'grey belt' concept—targeting previously developed land, car parks, and scrubland within green belt boundaries—aims to release sites for housing without encroaching on genuinely protected landscapes.

With mandatory housing targets returning and councils required to review their green belt boundaries, the implications for developers, investors, and landowners are substantial. REalyse data provides insight into where the development pipeline is most active and how property values in these peripheral urban areas are shifting.

The planning pipeline: 800,000 units and counting

Analysis of planning applications across England's major green belt regions—including outer London, Greater Manchester, the West Midlands, and key commuter belt counties—reveals a substantial residential pipeline already in motion.

REalyse data shows approximately 820,000 housing units currently in progress across these areas, with a 96% approval rate for applications that reach decision stage. A further 160,000 units sit in pending status, awaiting planning outcomes. Perhaps most telling is the scale of stalled development: over 149,000 proposed units are currently on hold or shelved, with approval rates for these applications at just 1.9%.

This backlog represents precisely the opportunity the grey belt reforms aim to unlock. Completed schemes in these areas have delivered nearly 660,000 units, demonstrating proven demand and deliverability when planning barriers are removed.

The data suggests that green belt policy has been a significant constraint on housing supply in England's most pressured markets. With over 67,000 completed residential schemes already in place across these zones, the infrastructure and market appetite clearly exist.

Regional price dynamics: where grey belt development makes sense

Property prices in commuter belt and green belt-adjacent areas vary dramatically by region, creating different investment cases for grey belt development.

London's outer boroughs command the highest values, with detached homes averaging £1.25 million and flats at £479,000. However, these markets are under pressure—London flat prices have fallen by nearly 11% year-on-year, while detached property values dropped 7.6%. Price per square foot in London averages between £606 and £662 depending on property type.

By contrast, regional commuter markets are showing resilience. The North West (Greater Manchester area) has seen terraced house prices grow 3% and semi-detached values rise 2.8%. The West Midlands and Yorkshire are following similar patterns, with house prices edging upward while flat values soften.

Average prices per square foot tell the regional story clearly:

• London: £606–662/sqft

• South East: £351–461/sqft

• East of England: £350–388/sqft

• West Midlands: £231–331/sqft

• North West: £198–307/sqft

These differentials suggest grey belt development in regional centres could deliver more affordable housing at viable margins, while London's grey belt sites will command premium land values but face softer sales markets.

Implications for local plans and housing targets

The government's mandatory housing targets require local authorities to demonstrate a five-year land supply, with grey belt review now an explicit requirement where targets cannot otherwise be met. This represents a fundamental shift in planning policy.

For areas like Hertfordshire, Surrey, Buckinghamshire, and the outer London boroughs—where REalyse data shows significant planning activity—councils face difficult choices. Green belt release has historically been politically contentious, but the grey belt distinction provides cover for councils to approve development on genuinely low-quality sites.

The data points to several hotspots where reform could accelerate delivery:

• Greater Manchester: Over 96,000 transactions recorded in the past year, with positive price growth suggesting strong demand

• West Midlands: Nearly 56,000 transactions and improving values across house types

• South East commuter belt: The largest transaction volumes but softer price growth, indicating supply constraints rather than demand issues

Councils in these areas may find grey belt release the path of least resistance to meeting housing targets while protecting higher-quality green belt land.

Land values and investment implications

For landowners with sites currently designated as green belt, reclassification to grey belt could transform asset values overnight. Agricultural land in the green belt typically trades at £8,000–15,000 per acre, while residential development land can command £500,000 to over £2 million per acre depending on location.

The REalyse data on price per square foot provides a guide to potential land values. In areas where new-build homes sell at £350–400/sqft, grey belt sites with achievable densities could support land bids significantly above current use values.

However, landowners should note that grey belt designation doesn't guarantee planning permission. The reforms require developments to meet 'golden rules' including 50% affordable housing contributions in some cases, provision of infrastructure, and high design standards. These requirements will moderate land value uplifts and affect scheme viability.

Outlook: delivery challenges remain

The grey belt reforms address a genuine bottleneck in England's housing supply, but challenges remain. Planning departments are under-resourced, with determination times stretching to 12 months or more for major applications. The 800,000-unit in-progress pipeline demonstrates that getting schemes from approval to completion requires consistent policy, available finance, and functioning supply chains.

REalyse data showing nearly 150,000 units on hold or shelved highlights how quickly the pipeline can stall when market conditions or policy certainty waver.

For investors and developers, the grey belt reforms create opportunities in two forms: acquiring sites likely to benefit from reclassification, and accelerating delivery on schemes already in the pipeline where policy clarity now exists. The regional price data suggests the most attractive risk-adjusted returns may lie outside London, where land costs are lower and house price growth more resilient.

The 1.5 million homes target is ambitious, but the planning pipeline and market demand exist to support significant delivery. Grey belt reform removes one barrier—now the sector must deliver.